Development of porous plug phase separator and superfluid film flow suppression system for the Soft X-ray Spectrometer onboard ASTRO-H

被引：5

作者：

Ezoe, Yuichiro ^{[1
]}

Ishikawa, Kumi ^{[1
]}

Ohashi, Takaya ^{[1
]}

Yamaguchi, Hiroya ^{[2
]}

Mitsuda, Kazuhisa ^{[3
]}

Fujimoto, Ryuichi ^{[4
]}

Murakami, Masahide ^{[5
]}

Kanao, Kenichi ^{[6
]}

Yoshida, Seiji ^{[6
]}

Tsunematsu, Shoji ^{[6
]}

DiPirro, Michael ^{[7
]}

Shirron, Peter ^{[7
]}

机构：

[1] Tokyo Metropolitan Univ, Hachioji, Tokyo 1920397, Japan

[2] RIKEN, Wako, Saitama 3510198, Japan

[3] Japan Aerosp & EXpolorat Agcy JAXA, Inst Space & Astronaut Sci, Sagamihara, Kanagawa 2298510, Japan

[4] Kanazawa Univ, Kanazawa, Ishikawa 9201192, Japan

[5] Univ Tsukuba, Tsukuba, Ibaraki 3058573, Japan

[6] Sumitomo Heavy Ind Ltd, Niihama, Ehime 7928588, Japan

[7] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

来源：

CRYOGENICS | 2012年 / 52卷 / 4-6期

关键词：

Space cryogenics; X-ray microcalorimeter; Porous plug phase separator; Superfluid film flow;

D O I：

10.1016/j.cryogenics.2012.01.024

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

ASTRO-H is the sixth Japanese astronomy satellite scheduled for launch in 2014. The Soft X-ray Spectrometer instrument is onboard ASTRO-H. This is a 6 x 6 array of X-ray microcalorimeters with an energy resolution of <7 eV at 0.5-10 keV. Superfluid liquid helium is utilized as a part of the cooling system. To retain the liquid helium in the tank under zero-gravity, a porous plug phase separator made of sintered stainless is used. Since the vapor mass flow rate is only 29 mu g/s, any additional superfluid film loss influences the lifetime of the liquid helium. Therefore, a film flow suppression system consisting of an orifice, a heat exchanger, and knife edge devices is adopted based on the design used for the X-ray Spectrometer onboard Suzaku. The film flow will be suppressed to <2 mu g/s, sufficiently smaller than the vapor flow rate. In the present investigation, the design and ground experiments of a helium vent system composed of the porous plug and film flow suppression system are presented. The results show that the phase separation and the film flow suppression are satisfactorily achieved. (c) 2012 Elsevier Ltd. All rights reserved.

引用

页码：178 / 182

页数：5

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